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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Equity, Number of Shares, Par Value and Other Disclosures [Abstract]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 400,000,000 400,000,000
Common stock, shares issued (in shares) 196,976,288 194,454,329
Common stock, shares outstanding (in shares) 193,797,887 191,275,928
Treasury stock, shares (in shares) 3,178,401 3,178,401
Unvested Restricted Stock    
Equity, Number of Shares, Par Value and Other Disclosures [Abstract]    
Common stock, shares outstanding (in shares) 6,145,795 4,770,097